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Test Dr: Camshaft Position Sensor: Testing

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NOTE: Proceed to DTC testing steps listed in FAULT CODE SETTING CONDITION  table of fault code setting condition.
FAULT CODE SETTING CONDITION

Fault Code KOEO KOER Continuous Memory
P0340    DR1  DR1
P0345    DR1  DR1
P1336  DR4
    NOTE: For additional testing information, see DIAGNOSTIC AIDS .

  1. 1) For KOER & Continuous Memory Only DTC P0340 & P0345: Check If Engine Will Start
    This DTC indicates PCM can no longer detect CMP sensor input signal. Possible causes for this fault are:
    • CMP Circuit Open, Or Shorted To GND Or PWR
    • SIG RTN Circuit Open (Variable Reluctance Type CMP Sensor)
    • CMP GND Circuit Open (Hall Effect Type CMP Sensor)
    • CMP Incorrectly Installed (Hall Effect Type CMP Sensor)
    • Faulty CMP Sensor Or Shielding
    • Faulty PCM

    Attempt to start engine. If engine will start, go to next step. If engine is a no-start, DTC P0340 or P0345 is not the cause of the no-start. Perform symptom checks under NO-START/NORMAL CRANK under SYMPTOMS in TROUBLE SHOOTING - NO CODES - CNG, FLEX-FUEL & GASOLINE article to diagnose no-start concern.

  2. 2) Check CMP Signal Sent To PCM

    Engine running. Connect scan tool to Data Link Connector (DLC). Select CMPFM and if present CMPFM2 PID(s) from PID/DATA MONITOR & RECORD menu. If a fault indicated with either or both CMP sensors, individually diagnose CMP sensor(s) indicating a fault. Then go to next step. If a fault is not indicated, CMP, PCM and harness(es) are working properly at this time. Go to TEST Z, step 1) .

  3. 3) Clear & Attempt To Re-Generate DTC P0340 Or P0345

    Clear DTCs. Perform PCM RESET PROCEDURE under CLEARING CODES under SELF-DIAGNOSTIC SYSTEM. Start engine. Raise engine speed to more than 1500 RPM for 10 seconds and then return to idle speed. Repeat this twice. Turn ignition switch to OFF position. Perform QUICK TEST to retrieve Continuous Memory DTCs. If DTC P0340 or P0345 is not present, fault is unable to be duplicated at this time. Go to TEST Z, step 1) . If DTC P0340 or P0345 is present, go to next step.

  4. 4) For Continuous Memory Only DTC P1336: Determine CMP Sensor Physical Type

    Input Signal to PCM from CKP Sensor and or CMP Sensor erratic. Possible causes are:
    • Damaged PCM.
    • Damaged CKP sensor.
    • Damaged CMP sensor.
    • Base Engine Concerns.
    • Harness Concerns.

    If the CMP sensor a drop-in (synchronizer) type, go to next step. If the CMP sensor is not a drop-in (synchronizer) type, go to step  6).

  5. 5) Verify Correct Installation Of CMP Sensor

    A CMP sensor identifies the cylinder No. 1 power stroke. A sensor that is improperly installed/indexed can identify the wrong cylinder as No. 1, produce a tip-in hesitation and generate DTC P0340. Verify the correct installation by referring to CAMSHAFT POSITION SENSOR in appropriate REMOVAL & INSTALLATION article. If the vehicle has a miss and DTC P0340, possible ignition, alternator noise, RFI, and CKP concerns may be present. If the CMP sensor is installed correctly, go to next step. If the CMP sensor is not installed correctly, reposition CMP sensor. See CAMSHAFT POSITION SENSOR in appropriate REMOVAL & INSTALLATION article.

  6. 6) Determine CMP Sensor Electronic Type

    Variable Reluctance (VR) sensors have 2-wire connectors, Hall Effect sensors have 3-wire connectors. If the CMP sensor is a VR type, go to next step. If the CMP sensor is not a VR type, go to step  13).

  7. 7) Check CMP Sensor Resistance

    Disconnect CMP sensor connector. Measure resistance of CMP sensor between CMP and SIG RTN circuits. CMP sensor resistance values change significantly with temperature rise. If resistance is 250-1000 ohms, go to next step. If resistance is not 250-1000 ohms, replace CMP sensor.

  8. 8) Check CMP Circuit For Short To Power In Harness

    Disconnect PCM connector. Turn ignition switch to ON position, with engine OFF. Measure voltage between CMP circuit (at PCM or CMP harness connector) and battery ground terminal. If voltage is less than one volt, go to next step. If voltage is not less than one volt, repair short circuit.

  9. 9) Check For Open In Harness Between PCM And CMP Sensor

    VR type sensors are susceptible to electrical interference (noise). Harness shielding, where present, should be reinstalled properly when removed for testing. Using DVOM, measure resistance of CMP and SIG RTN circuits between PCM harness connector and CMP sensor harness connector. If resistance measurements are less than 5.0 ohms for each wire, go to next step. If resistance measurements are 5.0 ohms or more for either wire, repair open circuit.

  10. 10) Check For Short In Harness Between PCM & CMP Sensor

    Using DVOM, measure resistance between CMP and SIG RTN circuit (at either PCM or CMP sensor harness connector). Measure resistance between CMP circuit and battery (-) terminal. Measure resistance between SIG RTN circuit and battery (-) terminal. If resistance(s) is(are) less than 10 k/ohms on any measurement, repair short circuit. If resistances are all more than 10 k/ohms, go to next step.

  11. 11) Check For Shorts In PCM

    Reconnect PCM harness connector(s). Using DVOM, measure resistance between CMP and SIG RTN circuits at CMP sensor harness connector. See Figure-Figure . If all resistance measurements are more than 500 ohms, go to next step. If any resistance measurement is 500 ohms or less, replace PCM.

  12. 12) Check CMP Sensor Output

    Turn ignition switch to OFF position. Reconnect CMP sensor harness connector. Set DVOM on AC scale to monitor less than 5 volts. Start engine. Using a DVOM, measure voltage between CMP and SIG RTN circuits at CMP sensor harness connector running engine at approximately 2500 RPM. If AC voltage is more than .25 volt, replace PCM. If AC voltage is not more than .25 volt, replace CMP sensor.

  13. 13) Check VPWR Voltage To CMP Sensor

    Disconnect CMP sensor connector. Turn ignition switch to ON position, with engine OFF. Using DVOM, measure VPWR circuit voltage between CMP sensor harness connector and battery (-) terminal. If voltage is greater than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open circuit.

  14. 14) Check PWR GND Voltage To CMP Sensor

    Turn ignition switch to OFF position. Using DVOM, measure PWR GND circuit voltage between CMP sensor harness connector and battery (+) terminal. If voltage is greater than 10.5 volts, go to next step. If voltage is 10.5 volts or less, repair open circuit.

  15. 15) Check CMP Circuit For Short To Power In Harness

    Disconnect PCM connector. Turn ignition switch to ON position, with engine OFF. Using DVOM, measure voltage between CMP circuit (at PCM or CMP harness connector) and ground. If voltage is less than 1.0 volt, go to next step. If voltage is 1.0 volt or more, repair short circuit.

  16. 16) Check For Open Circuits Between PCM And CMP Sensor

    Turn ignition switch to OFF position. Disconnect PCM and CMP sensor connectors. Using DVOM, measure resistance of CMP, VPWR and PWR GND circuits between PCM harness connector and CMP sensor harness connector. If resistance measurements are less than 5.0 ohms for each wire, go to next step. If resistance measurements are 5.0 ohms or more for any wire, repair open circuit.

  17. 17) Check CMP Circuit For Short To GND In Harness

    Using DVOM, measure resistance between CMP and PWR GND circuits (at either PCM or CMP harness connector). If resistance(s) is(are) greater than 10 k/ohms, go to next step. If resistance(s) is/are 10k/ohms or less, repair short circuit.

  18. 18) Check For Shorts In PCM

    Using DVOM, measure resistance between CMP circuit and both the VPWR and PWR GND circuits at the CMP harness connector. If resistance(s) is(are) greater than 500 ohms, go to next step. If resistance(s) is(are) 500 ohms or less, replace PCM.
    19. NOTE: On vehicles equipped with 150 pin PCMs and Passive Anti-Theft System (PATS), reconnect the Transmission (T) and Body (B) PCM connectors only if disconnected. The engine may not crank unless they are connected. Keep the Engine (E) connector disconnected.

  19. 19) Check CMP Sensor Output During Cranking
    Turn ignition switch to OFF position. Disconnect PCM connector(s). Ensure CMP sensor is installed properly and reconnected. Connect DVOM between CMP and PWR GND circuits at PCM harness connector. See PCM CONNECTOR IDENTIFICATION and Figure. Set DVOM on DC scale. Using starter, crank engine in short bursts for at least 10 engine revolutions. If voltage does not switch from less than 2 volts to more than 8 volts, replace CMP sensor. If voltage switches from less than 2 volts to more than 8 volts, replace PCM.
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